First I am not really sure who the target audience to this movie is. But it is a lighthearted fantasy movie even though the subject is to stop 7 devils that run havoc in the mortal world.
Start is a bit implausible in many ways. But if you can live with that and don't mind this is a movie with magic/divine powers then it may be entertainment for you. Fighting is nowhere realistic even compared to normal martial arts movies.
You will not see anything groundbreaking here. But if you just want to click off your brain and be entertained without too high demands then it may be for you. It did succeeded in giving me a good time on a very bad day.